20634436 has 12 divisors (see below), whose sum is σ = 36146880. Its totient is φ = 10306760.

The previous prime is 20634421. The next prime is 20634443. The reversal of 20634436 is 63443602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3321 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (3012240).

Almost surely, 2^20634436 is an apocalyptic number.

It is an amenable number.

20634436 is a deficient number, since it is larger than the sum of its proper divisors (15512444).

20634436 is a wasteful number, since it uses less digits than its factorization.

20634436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234 (or 5232 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 20634436 is about 4542.5142817607. The cubic root of 20634436 is about 274.2821431723.

The spelling of 20634436 in words is "twenty million, six hundred thirty-four thousand, four hundred thirty-six".